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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b63d73c06a6d4a415adcfefd0d39e6ff99a9675b09398c931d092762580854ca' 
  AND token = 'L3FVRvNp+RY3EhCbzGWQ6C3UXT1sQjxv9rjWyCCxGks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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