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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1730f856240c28a5352568320173498f709bd101d6b1f239d72540a1d96cef2' 
  AND token = 'ytc9XW5MuAZIwzbQiLJ3yuRWYc0WZ9+L9Z8L57MFdhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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