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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8b31b1e1a4ca05110f36dfa459441d8704dc1cad8ebb95394a3a7d9572e5c9' 
  AND token = 'W14sKGmqyzTORodvw2yXwZLKZ57UN/qAAdn/4s6sWCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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