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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a19d585d12597982097c647d567e9ae40cf1f27f4295583ef7bd039f30a041d' 
  AND token = 'iTVevAI/9tD88cI6Iq3r17xQlS77D7nUMwxunrqKfig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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