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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dc53442d9b08a6b3413816f06b799583d0a3e570f78072f3b2820f55000f120' 
  AND token = 'NT3qdcZ2zaGI1l+RxBHU0y8b93eC2FKpUI7k+108Rvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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