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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6494e99a7da0d6006fed27e605bc81a2115811d3c96d58b8fb86e7de3dbb0b0c' 
  AND token = 'fwGyr9QuyNebbAj5cVaWhvdftYk/lUXED/7rVlpuAX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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