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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83be8d57c28a60071ba604b5ed385bf0e6cc16f15928b44556234daae871232c' 
  AND token = 'o60xxRNf0eVff7Dem6VpG20eAHk6m1umAAquUdNCRcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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