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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82aaf6e00b77bb60d7b3b8f28a59d164623da53aa999419a0934494e5a23f1a7' 
  AND token = '5D4nYXgGNajVTI5DDN10zATwDI5T5/sz0zA1lSkX4Eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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