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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa224b1c16cc43cbad9265278d7e57dcaaf7499b6f74afc98d07640da19a6e96' 
  AND token = 'naWvwKGRbbA0KfNPuXS9/5IaumT4T+Ww1/EnwQVECCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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