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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa024371478e74f23a6aaf42c1ae01c7a913aff0196d2c54aa013d29df7eb84f' 
  AND token = '7EzDLJkH1h0XA54NZIJRFHCrTqOsYUWEnaIddDjJQYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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