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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcff41bb13b5f88eba81230514bf8e1786dc57e1ef34b88d40d27590d8d0bd5f' 
  AND token = '1IIxMtZKLLbmUK745UDGd7pcVBqQddx7mjDKcVE8qJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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