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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a931d79bd27cff1c5997328aa80d2bb3f3df7fb795a265408b00e2cd77d948' 
  AND token = '5v2xuEp4AAuaOWD+FuCK03TkhVDZPJOaTf0Dwv1TysI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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