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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f77d1ca646bb95ea9a5224b432b099bc3c017dfce5b3132b15bec919ca6f4787' 
  AND token = '3rdCBPnOvOWC6ceOQ3shxbwrZtZo1D5Xwu6CDuAzP/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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