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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b6e37468e5f7cdfb44bb21ef0cc020c5e905e74321034876b7ecafd21ffa2e' 
  AND token = 'zjbc7pFDo3FyAxV22xZacbIeeUGaQdQ2yYpHtLLLd0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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