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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a9d7aefc44f22c1caad9afc127e5328ca0ada8b814ef886e168c7efdb83311c' 
  AND token = 't0yovpBRwsaMtKKWYd/UG51UOOSJC3CZxQJ05BKkfRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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