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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86baeae900baed9a2d624cba588ae0d6a353b1823cd08cf3de09d9c87cf061db' 
  AND token = '3bP8jAeZy2U2YfgbjlHzL7bgQmSaj/rEaqf0WpnAIHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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