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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfaeb4649a99d44c0ab507f98649509359a3734ef0fc194f63ab14b2b1af3f1' 
  AND token = 's7HE7dUk9mmXB2Z1oMDpqzAmwXddmPvNUi0ZinGoPEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}