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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a98da4187d4aef43f3adf00d32cb805df6c35391de3476e3ba6b10a19b9d4c' 
  AND token = 'XiPA2Z9GBdNuoei18Zlx5ePZ32JlurycQwO8M8EEJlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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