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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbad6255a6fbce5ce3e64d4f6d4906e1e70c1216f1321b1696b08c93ba3dadda' 
  AND token = 'eZkDYFkRgSYrvfvVho0LmYGrqWYPB3k8Wc8WoVKk5Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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