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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d4057d885d7a42236596b7eebc0a70746e2c80585fa7dc83517c7dab441efd' 
  AND token = 'DVxTa16AIGQHb9pcz/SbBS/smwHBiwDp7/EwLBzIr2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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