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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655b53d6a0bf048fc27f5489054b8a82e88ec060f5dedb52a9debed7618dbe02' 
  AND token = 'waB19N00TL5hgFtrD6wtH+Ys/+RDZqfQx5FDt4bXrPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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