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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839e819c3b4149ec82935b7bed0fd66be3ceaab37d9d2c56d760350191c91d77' 
  AND token = 'bnPZhxAvhUDdf8cDOwg7OMrdyAdUt8mnYUzZxseD2rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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