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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '681f4a34ed01d8781c695f438f8ef2abbbcf68d8a2a8f3c7f09a2c47e97dbeb0' 
  AND token = 'XOtzeYnv2L7H4FCb/JZ4XR4SiNTpYfj0T9KM6vswmPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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