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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8fbb6bdcf694d5b31eab53dd9c3649780d00773a63b00b50ec2e2a502e67b68' 
  AND token = 'UmKutGpT4h9wWzUFWNrLQ5N3gZk7+wp+a0WSGNxDtos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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