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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b01c8f562e722c726ad8c8817dcd601c1fc2bc94117daa28af308b43077f121' 
  AND token = 'L76VnLA2EPs8M+cr6bYp20NtX2O/red69eo8Es7YPXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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