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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9579f1005519b70e875a1500b2568788f3da95aae926bbaa163fcbb2f9be06c6' 
  AND token = 'jtrlyq7cZolKhcUczf3+WYACzJ6Y2E6x7Olh+XJb/AY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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