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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67af8e708c76fd6c9f7d1880f2a6a32ea2e436e4e013665ea666ce8132e32d39' 
  AND token = 'RAqU4VKIiFM4thkwF0Qew3xn6jLzL0faTsZ2japbVEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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