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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5279b0a0732f6b863f52bba4752e6e5afadfd093833f61ef17dd4c12f1e3cc6' 
  AND token = 'vr4whsKTW0duED8LUibjwe2NwEviBQ11kS5H27d/vus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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