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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd2c4f4b370a7dd756b82ab404eb64e2e080e96e6ec5d0aace025e440bbca718' 
  AND token = 'svGameI82CRUTgqld7plraaiIqmc+EAO+7qnY7wMD/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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