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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e95ada3fd4a9ff444b17fe7b7f617557d7bbee10f9296456ca4086f5d9cdade' 
  AND token = '5ZI7kDBcniyP57PsE7nXbc8GUj3WDdCWr/TIWbizNNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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