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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4c0c3c391dd09420d99231cfbe93f0b95c33aad1ed1a7e604529215b854a14' 
  AND token = '5+AzV5+cmX682uJFLtmngIH7VUsf0jNBOF/T2j7gKuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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