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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addd96f238c7f82134b5fb4ffa2064b26a2eaa4884efed7286c24686a5a81f81' 
  AND token = 'JtjlzT6dbrvQmrOHy9X1LGEa7YpH/D8XfBzITAUL8GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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