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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41882cbc7dcd73773471ceccab08e7a08efd15b855eb81efd0e5655ebbbb79f3' 
  AND token = 'N1iPJ2Isnaj1hmb0U81Cpfw1e/ynB7CKPDgQeQYnXzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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