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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb6cc6168e0b3fc1547b697ee2fe8a54ade788e05fde4fe2e021027c075e83b' 
  AND token = 'PeNuWIDP4EidGKpJNrv+6CZYlwJNjxUWbkorLykn6K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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