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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1032f6e6886130dcd913407fd320e2bf4898eca476759b5842f4427700886a9d' 
  AND token = '7GM2GBIjkodpRwZXIBetEUP+Fo0GO8BwFpcKcXD11yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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