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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76bee0b68b120cff554eab8606be71ca1ebe1c89f9ed0132de312cb5f1be2b21' 
  AND token = 'Ulohc53G66ZvZ1Qvzg2aXhSpXO2r7+7YfoOujhkDVVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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