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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d89372d673a4f53eecef8fb88c62dffc28be7b91790647eeb7ce1a897bdf551' 
  AND token = 'V8ct8y9gBYa4TzUSOruXb42uf7MUxhPjI9l+a3AnamY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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