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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c718a382b67b72d0ff3174c336c67e0cf73ecd7288793fe5a56fbf9f3e4b3c6' 
  AND token = 'QblsT4P7GM7QA2XbAP6+zt+7KSmXqqbmAJp2V1JZaag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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