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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edf08e2df3c495915f45bb9c110c5dd476ee4ec649ed73f912320d6e434fae3f' 
  AND token = 'voapsfY8376zXFTpp5Laygo1BJ2Dq66aHuz89AwF5Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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