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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb30e8eae2a48d4bff588ecfec72e410b3153b06a75f43feceb69fbb38cef8c2' 
  AND token = '+4pY3iLDsUDlXPiNC1hiJhM3WrRm/qroWADIgFMIXq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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