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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bc7ee8d824652ebce0519cb342e613e9fb532df93192af9b55211928494ae0' 
  AND token = 'sRLxHAp+xM8BoyqypsGCXcQJEHPHKpmJoSliRgcEa1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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