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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5f752ec3a3965fc0de719ab73ff4144bd8033aa5b81df94ecbb96e41e9f4ec' 
  AND token = 'EwapJY7udsXFlaaO0xhJoT144zrW6qW1PByzGlyh69k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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