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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ddefe29eab06a4a5b867c35bb90f8cbe01ce5fbd3d4ad6f1235cb4b3e31b834' 
  AND token = 'SvyJ0kTnEr6Uym5H+yPi15hbIH+RHi7tdgjbubv9PJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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