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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af31debc1c0606b740532d30619894f948709b3b2cc72e45b6480b40f73c2f3' 
  AND token = 'proxr2+xa7CGLwQMEsFfdtLzgAS5FAC0RYiMRV+V/ho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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