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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92e6a8475c759f9a5c47dbd608f50059bef5669692e211455bd13ee0d4d26df' 
  AND token = 'exOj7J3xeYclkfE9Lkl2zbLsnMzzfQPh698veiCLDaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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