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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '213ffdaca0091ba548e3aa669513adb226f3678d903203229165fcb37f0a8650' 
  AND token = 'qRHPBadT1hQv/MJb9v9LlftLT5ON3CiUKx0X5Oi+/mc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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