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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf05b8a5f5bb028d19a625a5fdb85c200f7b652aa49439ed681f721d573aee6' 
  AND token = 'lTJIPOvMygESTnV9qYz5NOMtv3xOk+MSLhH3Gy95oQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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