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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d66b5ec4f4e8c0d94fded5b8b46c6e003894c1b78662cf0fa731d8c458228ab' 
  AND token = 'bWNtg3812cwyKxjqi3DoL7+M0GGBrcGRxo7I09yHZHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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