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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85d95235abc78a91435fd6b579db0679cd3ecd5e3f23beab6d85c87fe4f4c6d5' 
  AND token = '3zQiz4ws2wseR8zIvJQJS/fEmdSUNj7YeQrSB9/ezxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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