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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3478b0620a91cfd32dad39e2ee66d8c79dbdb70894f50f814a1d595f8919cb09' 
  AND token = 'Lcysz4fGiyttgO9J1/C/Re/yrw6ydOXAQkW8ATlSs5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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