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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88318c6f25aca8bb7614db10272aa549b7b616e72d526350a8345d9741ffda3a' 
  AND token = 'rmBO2QgLaVjrxKyzEuSI4c7gd1V08XAJlJC88Tz0wDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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