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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feadb69e4fc2aed58187ff9350bfe0a8bf809232ca8a01876e4f5c8ddef8380a' 
  AND token = '6RxgcM7AT12LfZE1/zBZBXwV/9eAVuLYNBqWe+N4oB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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