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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba0b8128623464ad90cf3d740af2d584f358aee2a947f93b3c99e8fb05f1222f' 
  AND token = 'UE9R2VDrB7Ij+RsONIpnXIUbbrOWBCkxbzf6qVUj5u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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