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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f7848643c6ae8be7482434c3691dc8e18b7449d08c2cb1ce721139d8ecaf676' 
  AND token = '+FW+yunsfXN4vKxPof/hihDhf7BlUfHs60snYA1HGvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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