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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c8e3f3d514b6f28171e22b72cc271abb0cb67ff790db8f900180531e414ed9' 
  AND token = '1nXHfgeb4Qs9R2E16cIF1EkyJJo82tfhu/Ut9ayhD5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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