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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d6906db70852b4513a898aa5d4ae7f1df5ad223c411642e429f1d7a8b09daf' 
  AND token = 'JTbTczKgNnd8eWPlDALmEbcxQEGc+R3IMZt4diBsSO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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