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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022fa632db1b31c07380f3b180cdfcaa6ffb6be439af2a35ccb9f1488d6a7b20' 
  AND token = '39oTMGpS9JeGjcnZbYVMdfnJxo56HQg5rm9+gWHohrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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