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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c5e6029f4a89d1939066d3daed9ae58d9a54d4857fec8c4d02624b65541b34d' 
  AND token = 'A8hVb8RuYgAEpVC5NVubNuDD0W8t+ZZTZvf6o8+dkzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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