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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce20a9739840507c431cb58c4ef2e2ad5d5033e5d4b7c4717eecd2e35e3944de' 
  AND token = 'Yt05lFlHhOn1INWZnvPlnSowS4KOwnBVfny/vHAroDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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