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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c60384f2c28d5f57374aac1a72d36f9e79b9654d4ab6a3b4e7f11feb2bc30aa' 
  AND token = 'R4WONwGWBTI9hDRCwmyIfqHk8LhI8ah8fHRcUDT5iFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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