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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bfcf84bcffda2209abeeeac9a70c6aa210e056a754ad813d3ccf7bb57e9a011' 
  AND token = 'FR4V9j3H93a0GPzKmvpNteNTJlY3x+nmVmSg1+Rf/9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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