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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275e0f5e6ce8cba61586ad47fcd7f72998710f5d93733754e5336a4391c75a79' 
  AND token = 'pakeoW4jzuqaIS/89Gj9utx+6WGzEW30aUYMyFUvjKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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