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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '713e38a3edc84dbc30d8c7f5e1ad0c419a9b36bb2fb41e11d9356d3eb981229b' 
  AND token = 'lwqUy5S5UFcEqxj06FSvpmoZjx5OqeMrqZ+97roHR+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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