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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe817f71207cea3138b323e5e3d1a8d52afa7dbff3318f2e251f4c6f5f3aaab' 
  AND token = '9txjCBHZE55yMMKFKMIQuU3ovr6Uee+28myPzhzN6oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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