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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27fd4d8885f8f91402eee2c5eb01b26d0ffbe658de49bb4f298b0f169b80dea1' 
  AND token = '3W+acRRlla1BcygYSW7TUxseKa3XuWODmAq8/7gQkXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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