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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82cc3ca0811dd0c65e1f7a566584cdbb151cd825d2ea4c5771bd41e938cc9d55' 
  AND token = 'uWn60pAItMwFBwP26zgRf0uHMttuw06raBRT0TJ0ZB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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