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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a54a87fb5a7a210f995dcb8d3a96f96f92cb3c0dbdd9a2420be8d3b023e08d2' 
  AND token = 'q+BLqH+Y4C52+JSEgo8rP+CLJ0GJ5JnVxdlWrcfXlis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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