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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '789b7a4af896a3051a2f9f0eeedab87c1cd67c80d714601bc63a8e6a0c9e665e' 
  AND token = '2y6GKj/r7V5447BlnnT3cgUIsShuiEMnfhs08rj8jas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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