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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e624b9625bd6f57c0824a2276c7e6af100fb31d63f626ca206385cfa24e419ec' 
  AND token = 'w+0B4qGUDVShmrtXBbByZoBtki62Br31PCWuxTow7e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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