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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934c87b649561a7ec7efe6a2432204a7e96d9af0fe5fbfc5d8d6710475d58ab9' 
  AND token = '9bR3hfx5Swkp2nqVgPpEL5jLMgT7WoD8AUvzPbmCrfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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