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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bbefef9b38394fc17f65c43a10f0d1afc53661424d38765c0449e87f691ee9a' 
  AND token = 'rVxZ4YV9jV5lM647M1IYCnhdLGV62XuocIm/jeuLS14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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