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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83a651d572068b78c8d46373e3370d1f461a6c479103d0bbd8f6956f68bc9bd8' 
  AND token = '5ZYxrMkcoKyxNtmuVaNu84Qgue7c0TOrAxIV/tSDYzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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