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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2104f22f09f001052538c803efb1525ea88f2aac1a81210b29abe52dcb10e9e6' 
  AND token = 'zQ8k/xOdzftRjXDKliSf3odOTz+aEzWt008w8hpzRBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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