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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d3024d2bd5488dc22d9b3f89aff28e95286ed7deca241f6c5eae33be62d2391' 
  AND token = 'G0l28BA9Y1yGMbUtgM5F78+R/nVlZS3PJOtjKQd6pTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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