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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8682ebe1a2f547313642dff52c4804ed9f5055d9a7a58c5d18b830f28668b08a' 
  AND token = 'XDOeb3WhWiTV8Qo0q2ciEZiIq20oSIAdaEKYawYlrS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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