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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9def59d50cc86c76ef527e0068a9b00a1af15709c4ad5ba90c744a906b4f74e3' 
  AND token = 'UyPgHj54FclKbfi0VqWVWJRiuuLG3iPeI99HGWoSJ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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