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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3052239c59e0e4efa40938ee2768015ef4def45fd4c815be2da5f61a4b5cec3' 
  AND token = 'XThArL/kFdNGm7OAW9Nywo/4oj3Xsg7S/LMKvsJTiu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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