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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '829b6a588cbaeea2fa582c2d187d208604200c81506cc160e230da57efe41589' 
  AND token = 'gH1QI0cPMFiKJm5PzWlkai4L/42oYEa6T2i/Llq+sSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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