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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776303f420503e4599b39530839f790ba240cdd84dbdd7cf0f43b0598dc979e6' 
  AND token = '2LzwgAcBbpoLbj8NSUWyK3RAhYjoTtHAEqB9uNiCqgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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