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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724a8f020a678828b8fde0efd10776c7d312b146392929b473ffa75583ce7c27' 
  AND token = 'iVMg8QPlmLvAENP1tS27eLRVic7hzM2ARrreVpIbVm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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