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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06362b6003a53c0c620776d5284e2e3475646edd62c74614ac45355d5137fcaa' 
  AND token = '1mHrQ7cgICZ8nAr2mwQtXb5+aGV4Q6uUXnoLY51K2Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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