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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eb11cee7b14eb680b20fd0ba76a0667dcf7087789eac40066c424251c2b4b9f' 
  AND token = '0HiFoazcgYd5Qpi+UNLmlzT5GrXb0/G62TMsGvVKwvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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