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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fea94257d30ac1b34356c1e9452300993e08f4423d764e445274838187ae727a' 
  AND token = 'BiK8hoxFLq/LxnhMp32QwA8mEZ8a+KCmC2H9YyCrUaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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