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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d5cff8ae62c917cac3bf0ad5e36ff6237fda7245a2ecbe1796030281a25759' 
  AND token = 'Gv91byZvgDqHQ+2K3Lou/nSjO6071SaJKjECia2lUhE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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