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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24e5616b600b72291781a04f17d8d0128fe7651562186cb2beef554adb5e444' 
  AND token = 'EASMqbecsGg70ykPmcEwN4WJfGH+9BkDTzgm6O42Nc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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