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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84f08ecd6812620c1582818ebc794ecd923f0246b6dcd7a0f8a5f888063c980' 
  AND token = 'z/TXdjkA6V/1mA3SjprRIDS49yMpmaN0ar19GDMsrKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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