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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcbaf9d6e03e84a2a781a60fabbb85431c62179c5e31a3a8f4753cdda8e46be0' 
  AND token = '2+yry/KEGEn2vYGvBlwtt81KiBDOBfTamher9KvVFWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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