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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa38ccd3bd999a3a869b4622bef5ba587cd800474fc72b3ebb033ec0f8336cb' 
  AND token = '30u5jW2QHgsk4XNNll93VDudUkFRf2xD9L9Dxn2xXX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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