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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca14e04454ebe07750b6795be2831eeddbf5fee9d4fca6a339a3a24edfb9d92' 
  AND token = '6oFfxWlm0QcQjWSqjx6nWYTvWvLoERvm4Tvgy3jo168=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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