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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e85c4553222c8e193793228f4d89b6ffff08e06af3facd99e08a5df554335e' 
  AND token = 'hvKW+8VWu2MqljvkpKUVMDavWjL1XYttsJS31lq99aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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