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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a46dc8a5d157ff37d0b012187a6ff4276adba011bef97133ded29d7e7dbdae28' 
  AND token = '2gClh/oIaAc9xkDfLkCA0ABNMBeQmpFQduW+0NlEXvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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