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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590dcd09ee90b1f21d2c3fec9e200553f1cfa007a6c634f4ac6943b0303d6cf7' 
  AND token = '19vp3ui5UlfWXT4wD5bO1e5k6ZTobKUxcYQztVjxnGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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