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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5c96e41cc71a7f15fb26a26de7371e33b483e32d167f2dac35a7b18a47cb982' 
  AND token = 'TQBjn0tx9pUd4lIyyzWZp7o813jBY4/Sr3gSFerFDGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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