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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023e08c8b89737f2ce095b48c5a4e0e239e968615f1f03d4ee69b604973b9c1a' 
  AND token = 'mEkVg0FDpdD8z0wDL7DWcylanLERLB9pRfWjijXddpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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