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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce8d7b3ecf57394e775e5378309fb83a6176753d7792deb7b3ca070b4776fee3' 
  AND token = '+P9QuPyPOcG1WZSVan8lo6GM6hydbLXf4EaPMd7LBGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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