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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cc224bfe3e82ece1dc6785d61478a9c199165ec30fd4666dc2d3cf82c295d0' 
  AND token = 'kKsFTobSYXRftBhMZvJadresv5SvkRJd4KxnBu5o8hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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