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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '237c5309de4be5046a96ded8d67c69a9a2ddd5b23aa5a8b8ba6c4efd7ad76c96' 
  AND token = 'ZWPSMUhmkI5WpZk9kTBYlt2WDgUS2w2mn2yo/SHoaE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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