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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c36e0966e2aae63513dd05a27c586b1433dbe71fefa9f920a8ce733625a14cf' 
  AND token = 'T1xIwRjsjFaQGE4cjzatNBvjcVCqmydteDMv6u9Ft+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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